This is not stopping the invasion but it may hurt the occupation, if not make it impossible if backed with military support for a resistance.
*This will take years to happen. (Approximately 4-6 years from now).
You can't forget that Russia is invading Ukraine to resettle it. This is no Afghanistan, a country on the other side of the world. Ukraine is right next to Russia, and the entire purpose of the invasion is to (badly) build a new nation. In this case, Russia has all the time in the world and willingness to stay there forever.
The Economic Sanctions WILL cripple Russia. But it has to be constant and aimed at both Low-Class Russians and the Russian Oligarchs for it to absolutely destroy the country financially, and hopefully lead to one deposed Putin.
This is all according to the American Intelligence Community. Just hoping for Russian overreach and another Afghanistan is not enough for the invasion to fail. Russia could spend a century occupying Ukraine
because that's what they want.
Or at the very least,
that's what Putin wants. The Russians are not so sure, and that's the biggest failing in Putin's plan. That's the Free World's biggest chance here: make the Russian's biggest fears, about Putin's temper tantrum, a reality. Make them regret it.